clever stretch on the challenge subject...nice capture, i didn't like the shadow on the wall and you could bring more of the running machine in the pic...
good luck
"Getting in Shape " might have been a better title. I'd crop just below the shirt - the webbed belt is a tad distracting and takes away from the work out sense for me. I like the movement of her hair and the contrast is good.
She's a nice looking girl, but the photo does nothing for me, sorry. I can't see any focus on shape here - certainly can't say that shape is the most important aspect of this photo. Too many different shapes - some round, some angular, but no connection between the different angles, shapes or curves. The shadow looks like it's an accident - it would be very different if the shadow had nice clean lines that obviously echoed the model.